Download Instant Notes. Plant Biology by Andrew Lack, David Evans PDF

By Andrew Lack, David Evans

Scholar advisor to plant biology, permitting easy accessibility to middle details within the box. Covers constitution, vegetative anatomy, reproductive anatomy, body structure and legislation, progress and improvement, sensing finish reaction to the surroundings, and floral improvement and reproductive body structure. For undergraduates. Softcover.

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A combination of the number and orientation of pores or furrows and the sculpturing of the exine is diagnostic of plant families, genera or sometimes species (Fig. 1). The exine of pollen that is dispersed by the wind is fairly smooth and in some families, such as the grasses, it varies little. By contrast, in animal-dispersed pollen the sculpturing varies hugely from circular holes to projections of many sizes and shapes and the beautiful window-like form of some dandelion-like composites (Fig.

These give rise to a mass of fine, fibrous roots, all of similar size and prominence (Fig. 4b). Root architecture always follows one of these basic plans, but is also responsive to soil depth, water availability and nutrients. (a) (b) Central taproot Fig. 4. Root architecture. (a) Taproot systems result when lateral roots branch out from a single central taproot. (b) Fibrous roots form from adventitious roots, branching out from the stem base. Section C – Vegetative anatomy C3 H ERBACEOUS STEMS AND PRIMARY GROWTH Key Notes Shoot structure Herbaceous stems are green and non-woody.

G. in unisexual flowers and reduced flowers of wind-pollinated plants. Sepal and petal structure Sepals resemble simple leaves. Petals have a specialized epidermis, often with pigmented vacuoles and air-filled reflective mesophyll. The pigments are mainly flavonoids with some betalains and carotenoids. Insects have different color sensitivity from us and the colors of petals are different and more varied for insects. Stamens The filament bears four or two anthers. The anther wall has three layers and splits (dehisces) to release pollen.

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